JPH08190762A - Magnetic disk-array storage device - Google Patents
Magnetic disk-array storage deviceInfo
- Publication number
- JPH08190762A JPH08190762A JP7001035A JP103595A JPH08190762A JP H08190762 A JPH08190762 A JP H08190762A JP 7001035 A JP7001035 A JP 7001035A JP 103595 A JP103595 A JP 103595A JP H08190762 A JPH08190762 A JP H08190762A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic disk
- storage device
- magnetic
- cumulative
- information
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
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- Digital Magnetic Recording (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複数の磁気ディスク記
憶装置を持つ、磁気ディスク・アレイ記憶装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk array storage device having a plurality of magnetic disk storage devices.
【０００２】[0002]
【従来の技術】磁気ディスク記憶装置では、情報の記録
密度を高め、小形で大容量の記憶が可能な装置が求めら
れている。このためには、磁気ヘッドと磁気ディスクの
間隔を狭めることが、磁気記録の原理から要求される。
しかし、磁気ヘッドと磁気ディスクの間隔を狭めると、
両者が接触摺動しどちらか一方あるいは両方が摩耗する
可能性が高まるため、両者の耐摩耗性を向上することが
装置の動作信頼性を向上するために重要な課題となって
いる。このため、最近の磁気ディスク記憶装置では、潤
滑剤を記録媒体表面に塗布する等の磁気記録媒体側の改
良あるいは、磁気ヘッド基板に耐摩耗性の材料を用いる
ことなどが広く行われている。2. Description of the Related Art In a magnetic disk storage device, there is a demand for a device capable of increasing the recording density of information and storing a small size and a large capacity. For this purpose, it is required from the principle of magnetic recording that the gap between the magnetic head and the magnetic disk be narrowed.
However, if the gap between the magnetic head and the magnetic disk is reduced,
Since both are likely to come into contact with each other and wear one or both of them, improving the wear resistance of both is an important issue for improving the operational reliability of the device. For this reason, in recent magnetic disk storage devices, improvement of the magnetic recording medium side such as applying a lubricant to the surface of the recording medium, or use of a wear resistant material for the magnetic head substrate has been widely performed.
【０００３】しかし、磁気ヘッドと磁気ディスクのそれ
ぞれの表面の幾何学的平均面の最小間隔が５０ｎｍ以下
の磁気ディスク記憶装置では、磁気ヘッドと磁気ディス
クの接触頻度がそれより間隔が従来より増加し、摩耗低
減は最重要の課題となる。ここで、両者の摩擦面積を考
えると、現在の小型磁気ディスク記憶装置の代表である
外径４５mmのディスクでは片面の情報記録部分の面積は
おおよそ１３００mm2であるのに対し、磁気ヘッドの磁
気ディスクとの最近接面の面積は高々数mm2 である。こ
のような大きな差のある磁気ディスクと磁気ヘッドが摩
擦し、摩耗が発生すると摩耗深さは摩擦面積の小さい磁
気ヘッドが、磁気ディスクより大きくなる。特に、磁気
ヘッドの磁気ディスクへの接近性能を考えて、磁気ヘッ
ドの磁気ディスク最近接面の面積が０.１mm2以下とした
ものでは、磁気ディスクと磁気ヘッドの摩擦面積の比率
は一万倍を越える。このため、このような磁気ディスク
記憶装置では、磁気ヘッドの摩耗によりエラーが増加
し、最終的に装置の稼働寿命が決定されるようになる。However, in a magnetic disk storage device in which the minimum distance between the geometric mean surfaces of the magnetic head and the magnetic disk is 50 nm or less, the contact frequency between the magnetic head and the magnetic disk is larger than that in the prior art. The reduction of wear is the most important issue. Considering the friction area between the two, the area of the information recording portion on one side is about 1300 mm 2 in a disk having an outer diameter of 45 mm, which is a typical small magnetic disk storage device at present, whereas the area of the magnetic disk of the magnetic head is about 1300 mm 2. The area of the closest contact surface with is at most a few mm 2 . When the magnetic disk and the magnetic head having such a large difference rub against each other and wear occurs, the wear depth of the magnetic head having a small friction area becomes larger than that of the magnetic disk. In particular, considering the approach performance of the magnetic head to the magnetic disk, if the area of the magnetic disk closest contact surface of the magnetic head is set to 0.1 mm 2 or less, the ratio of the friction area between the magnetic disk and the magnetic head is 10,000 times. Over. Therefore, in such a magnetic disk storage device, errors increase due to wear of the magnetic head, and the operating life of the device is finally determined.
【０００４】以上のような磁気ディスク記憶装置単体の
信頼性の問題を回避するために、複数の磁気ディスク記
憶装置を組合わせて一つの磁気ディスク・アレイ記憶装
置とし、数台ずつを構成単位としそれらを一体として冗
長な記憶方法を用いて情報を記録し、記憶システムとし
ての情報記憶信頼性を高めることが行われている。In order to avoid the above-mentioned reliability problem of the magnetic disk storage device alone, a plurality of magnetic disk storage devices are combined into one magnetic disk array storage device, and several magnetic disk storage devices are used as constituent units. Information is recorded by using them as a unit and using a redundant storage method to improve the reliability of information storage as a storage system.
【０００５】さらに、これまでに一つの磁気ディスク装
置中の１トラックの延べ記録再生時間を記憶する不揮発
性メモリを持ち、このメモリ手段に記憶された時間が所
定時間を超えたときに磁気ヘッドを別のトラックに移動
させるものは、特開昭61−43082号公報に開示されてい
る。しかし、多数の磁気ディスク装置をもつ磁気ディス
ク・アレイ記憶装置で、それぞれの磁気ディスク装置の
摩耗寿命を検出する物はなかった。Further, a non-volatile memory for storing the total recording / reproducing time of one track in one magnetic disk device has been provided so far, and the magnetic head is operated when the time stored in this memory means exceeds a predetermined time. The method of moving to another track is disclosed in JP-A-61-43082. However, there is no magnetic disk array storage device having a large number of magnetic disk devices for detecting the wear life of each magnetic disk device.
【０００６】一方、地球環境問題に対応するため計算機
システムの使用エネルギの低減、特にアイドル時の省電
力化が世界的な課題となっており、磁気ディスク記憶装
置でも記録再生動作が一定時間要求されない場合に磁気
ディスク回転を停止する省電力方式が、可搬型の小型機
から据え置き型の大型機に拡がる方向にある。On the other hand, in order to deal with global environmental problems, reduction of energy consumption of computer systems, especially power saving at idle time has become a global issue, and recording / reproducing operation is not required for a certain time even in a magnetic disk storage device. In this case, a power saving method for stopping the rotation of the magnetic disk is spreading from a small portable machine to a large stationary machine.
【０００７】[0007]
【発明が解決しようとする課題】従来の磁気ディスク記
憶装置では、上記の磁気ヘッドの摩耗量の変化を検出す
ることは行われておらず、磁気ヘッドと磁気ディスクの
接触頻度が高い場合には寿命が短く信頼性が低下するた
め、磁気ヘッドを空気力により浮上させることにより極
力接触頻度を減少させ、ほとんど両者が接触しないよう
に設計された装置が主に用いられている。しかし、この
ように設計すると磁気ヘッドと磁気ディスクの間隔を小
さくすることに限界があり、今後の記録密度の向上に障
害となっている。In the conventional magnetic disk storage device, the change in the wear amount of the magnetic head is not detected, and when the frequency of contact between the magnetic head and the magnetic disk is high. Since the life of the magnetic head is short and the reliability is lowered, the frequency of contact is reduced as much as possible by levitating the magnetic head by aerodynamic force, and a device designed so that the two do not contact each other is mainly used. However, such a design has a limit in reducing the distance between the magnetic head and the magnetic disk, which is an obstacle to future improvement in recording density.
【０００８】これに対し、磁気ヘッドへの印加荷重を低
くすることによりヘッド／磁気ディスクの摩耗を低減
し、磁気ディスクとの接触頻度が大きい状態での動作を
行わせようとする試みが行われている。しかし、磁気ヘ
ッドの摩耗による寿命があるため、世の中に広く受け入
れられるまでには至っていない。On the other hand, an attempt is made to reduce the wear of the head / magnetic disk by lowering the load applied to the magnetic head, and to perform the operation in the state where the contact frequency with the magnetic disk is high. ing. However, due to wear of the magnetic head, it has not been widely accepted in the world.
【０００９】また、省電力あるいは摩擦距離の低減を目
的とし情報の記録再生動作が一定時間行われない場合に
磁気ディスクの回転を停止する磁気ディスク記憶装置を
用いる磁気ディスク・アレイ記憶装置で、従来は情報を
記録する磁気ディスク記憶装置あるいはそのグループの
選択は累積回転時間の多少を考慮せず行っており、磁気
ヘッド／磁気ディスクの摩耗が磁気ディスク記憶装置毎
に異なり、摩耗が早く進む装置が発生する不都合があっ
た。A magnetic disk array storage device using a magnetic disk storage device for stopping the rotation of the magnetic disk when the recording / reproducing operation of information is not performed for a certain period of time for the purpose of power saving or reduction of the friction distance. Selects the magnetic disk storage device or its group for recording information without considering the cumulative rotation time. The wear of the magnetic head / magnetic disk varies from magnetic disk storage device to device, and the wear progresses faster. There was an inconvenience.
【００１０】そこで、磁気ヘッド／磁気ディスクの摩耗
損傷を平均化し、磁気ディスク・アレイ記憶装置の記録
情報の信頼性を向上させることが、本発明の課題であ
る。Therefore, it is an object of the present invention to average the wear and damage of the magnetic head / magnetic disk and improve the reliability of the recorded information of the magnetic disk array storage device.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するた
め、本発明では、情報の記録再生動作が一定時間行われ
ない場合に磁気ディスクの回転を停止する磁気ディスク
記憶装置を複数台持つ磁気ディスク・アレイ記憶装置
で、各々の磁気ディスク記憶装置の磁気ディスクの累積
回転時間を記憶する記憶装置を設置し、この記憶装置に
対応する各磁気ディスク記憶装置の磁気ディスク回転時
間を記憶させ、その値を平均化するように、情報の記録
を行う。In order to achieve the above object, the present invention provides a magnetic disk having a plurality of magnetic disk storage devices for stopping the rotation of the magnetic disk when the information recording / reproducing operation is not performed for a certain time. In the array storage device, a storage device that stores the cumulative rotation time of the magnetic disks of each magnetic disk storage device is installed, and the magnetic disk rotation time of each magnetic disk storage device corresponding to this storage device is stored, and the value is stored. Information is recorded so as to average.
【００１２】具体的には、情報を記録する場合に、新た
な情報を記録可能な磁気ディスク記憶装置またはそのグ
ループの内で、磁気ディスクの累積回転時間が最小ある
いは最小から所定の時間だけ多い範囲の磁気ディスク記
憶装置あるいはそのグループを選択して情報を記録す
る。Specifically, when information is recorded, within the magnetic disk storage device or a group thereof capable of recording new information, the cumulative rotation time of the magnetic disk is the minimum or a range in which the cumulative rotation time is longer than the minimum by a predetermined time. The information is recorded by selecting the magnetic disk storage device or its group.
【００１３】[0013]
【作用】磁気ディスク記憶装置複数台で構成される磁気
ディスク・アレイ記憶装置でも、それぞれの磁気ディス
ク記憶装置中の磁気ヘッド／磁気ディスクの摩耗あるい
は損傷が平均化され、全体として寿命の長い信頼性の高
い磁気ディスク・アレイ記憶装置が構成できる。Operation Even in a magnetic disk array storage device composed of a plurality of magnetic disk storage devices, the wear or damage of the magnetic head / magnetic disk in each magnetic disk storage device is averaged, and the reliability is long as a whole. A high-performance magnetic disk array storage device can be constructed.
【００１４】[0014]
【実施例】次に本発明を、磁気ディスク・アレイ記憶装
置に適用した例を、図１に示す実施例を用いて説明す
る。図１は本実施例の磁気ディスク・アレイ記憶装置の
制御回路図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an example in which the present invention is applied to a magnetic disk array storage device will be described using the embodiment shown in FIG. FIG. 1 is a control circuit diagram of the magnetic disk array storage device of this embodiment.
【００１５】本実施例の磁気ディスク・アレイ記憶装置
１９０は、磁気ディスク記憶装置１５０が１０台で構成
されている。本実施例の磁気ディスク記憶装置１５０
は、それぞれの装置中に制御回路１２０を持ち、磁気デ
ィスク・アレイ記憶装置制御回路１８０からの制御信号
により動作する。本実施例では、磁気ディスク・アレイ
記憶装置制御回路１８０内に、各磁気ディスク記憶装置
１５０に対応した１０の記憶位置のある累積磁気ディス
ク回転時間記憶装置１６０を持つ。磁気ディスク・アレ
イ記憶装置制御回路１８０からの制御信号により、各磁
気ディスク記憶装置は記録再生動作を行い、磁気ディス
ク記憶装置制御回路１２０は一定時間動作指令制御信号
が無かった場合に、それぞれの装置内の磁気ディスクの
回転を停止する。磁気ディスク・アレイ記憶装置制御回
路１８０はそれぞれの磁気ディスク記憶装置１５０中の
磁気ディスク回転開始と停止を監視し、磁気ディスクの
累積回転時間を累積磁気ディスク回転時間記憶装置１６
０中のそれぞれの磁気ディスク記憶装置に対応する記憶
位置に記憶させる。The magnetic disk array storage device 190 of this embodiment comprises ten magnetic disk storage devices 150. The magnetic disk storage device 150 of this embodiment
Has a control circuit 120 in each device and operates by a control signal from the magnetic disk array storage device control circuit 180. In this embodiment, the magnetic disk array storage device control circuit 180 has a cumulative magnetic disk rotation time storage device 160 having 10 storage positions corresponding to each magnetic disk storage device 150. In response to a control signal from the magnetic disk array storage device control circuit 180, each magnetic disk storage device performs a recording / reproducing operation, and the magnetic disk storage device control circuit 120, when there is no operation command control signal for a certain time, each device. Stop the rotation of the magnetic disk inside. The magnetic disk array storage device control circuit 180 monitors the start and stop of the magnetic disk rotation in each magnetic disk storage device 150, and calculates the cumulative rotation time of the magnetic disk as the cumulative magnetic disk rotation time storage device 16.
It is stored in the storage position corresponding to each magnetic disk storage device in 0.
【００１６】これら１０台の磁気ディスク記憶装置は、
各５台ずつの二つの磁気ディスク記憶装置グループ１９
１，１９２に分けられ、記録情報はそれら５台ずつのグ
ループの内の一方を選択し、そのグループの５台に分散
して記録される。情報を新たに記録する場合には、情報
を記録可能な磁気ディスク記憶装置グループの内、累積
ディスク回転時間が最小の磁気ディスク記憶装置グルー
プを選択し情報を記録する。この動作を繰り返すことに
より、各磁気ディスク記憶装置１５０の累積ディスク回
転時間が次第に均一化され、どれかの磁気ディスク記憶
装置の磁気ヘッドの摩耗が極端に増加し情報の記録／再
生が不能となることが防止でき、磁気ディスク・アレイ
記憶装置全体の記録情報の信頼性を高めることができ
る。These ten magnetic disk storage devices are
Two magnetic disk storage groups 19 of 5 each
The recording information is divided into 1 and 192, and one of the groups of 5 units is selected as the recording information, and the recording information is dispersed and recorded in the 5 units of the group. In the case of newly recording information, a magnetic disk storage device group having a minimum cumulative disk rotation time is selected from among the magnetic disk storage device groups capable of recording information, and the information is recorded. By repeating this operation, the cumulative disk rotation time of each magnetic disk storage device 150 is gradually equalized, the wear of the magnetic head of one of the magnetic disk storage devices is extremely increased, and information recording / reproduction becomes impossible. This can be prevented, and the reliability of the recorded information in the entire magnetic disk array storage device can be improved.
【００１７】[0017]
【発明の効果】本発明によれば、有限の摩耗寿命を持つ
磁気ディスク記憶装置を用いる磁気ディスク・アレイ記
憶装置で、磁気ディスクの累積回転時間を記憶し平均化
することにより特定の磁気ディスク記憶装置あるいはそ
のグループ中の磁気ディスクの回転時間が極端に増加し
その磁気ディスク記憶装置中の磁気ディスクのみが摩耗
することによる寿命の低下を防止できる。According to the present invention, in a magnetic disk array storage device using a magnetic disk storage device having a finite wear life, a specific magnetic disk storage is performed by storing and averaging cumulative rotation times of the magnetic disks. It is possible to prevent the life of the magnetic disk in the apparatus or the group thereof from being shortened due to the extremely long rotation time of the magnetic disk and abrasion of only the magnetic disk in the magnetic disk storage apparatus.
【図１】本発明の実施例の磁気ディスク・アレイ記憶装
置の制御系のブロック図。FIG. 1 is a block diagram of a control system of a magnetic disk array storage device according to an embodiment of the present invention.
１２０…制御回路、１５０…磁気ディスク記憶装置、１
６０…磁気ディスク累積回転時間記憶装置、１８０…磁
気ディスク・アレイ記憶装置制御回路、１９０…磁気デ
ィスク・アレイ記憶装置、１９１，１９２…磁気ディス
ク記憶装置グループ、２００…計算機本体、２１０…表
示装置。120 ... Control circuit, 150 ... Magnetic disk storage device, 1
60 ... Magnetic disk cumulative rotation time storage device, 180 ... Magnetic disk array storage device control circuit, 190 ... Magnetic disk array storage device, 191, 192 ... Magnetic disk storage device group, 200 ... Computer main body, 210 ... Display device.
Claims (5)
わない場合に自動的に磁気ディスクの回転を停止する磁
気ディスク記憶装置を複数台用いる磁気ディスク・アレ
イ記憶装置おいて、 各々の前記磁気ディスク記憶装置の前記磁気ディスクの
累積回転時間を平均化することを特徴とする磁気ディス
ク・アレイ記憶装置。1. A magnetic disk array storage device using a plurality of magnetic disk storage devices for automatically stopping the rotation of a magnetic disk when information recording or reproducing operation is not performed for a certain period of time. A magnetic disk array storage device characterized by averaging accumulated rotation times of the magnetic disks of the storage device.
ク記憶装置の前記磁気ディスクの累積回転時間を、不揮
発性記憶装置または前記磁気ディスク上に記憶する磁気
ディスク・アレイ記憶装置。2. The magnetic disk array storage device according to claim 1, wherein the cumulative rotation time of the magnetic disks of each of the magnetic disk storage devices is stored in a nonvolatile storage device or on the magnetic disk.
る場合に、新たな情報を記録可能な磁気ディスク記憶装
置またはそのグループの内で、磁気ディスクの累積回転
時間が最小あるいは最小から所定の時間だけ多い範囲の
磁気ディスク記憶装置あるいはそのグループを選択して
情報を記録する磁気ディスク・アレイ記憶装置。3. A magnetic disk storage device or a group thereof in which new information can be recorded when information is recorded, wherein the cumulative rotation time of the magnetic disk is minimum or predetermined. A magnetic disk array storage device that records information by selecting a magnetic disk storage device or a group thereof in a range that has more time.
気ディスク記憶装置の磁気ディスク累積回転時間がその
装置の寿命時間を越えたとき、前記磁気ディスク記憶装
置の記憶内容を他の磁気ディスク記憶装置に自動的に複
写する磁気ディスク・アレイ記憶装置。4. A magnetic disk storage device according to claim 1, 2 or 3, wherein when the cumulative magnetic disk rotation time of one magnetic disk storage device exceeds the life time of the device, the stored contents of said magnetic disk storage device are changed to another magnetic disk. A magnetic disk array storage device that automatically copies to storage devices.
気ディスク記憶装置の累積エラー発生数を不揮発性記憶
装置あるいは前記磁気ディスク上に記憶し、前記累積エ
ラー発生数が所定の値を越えたとき、前記磁気ディスク
記憶装置の記憶内容を他の磁気ディスク記憶装置に自動
的に複写する磁気ディスク・アレイ記憶装置。5. The cumulative error occurrence number of one magnetic disk storage device according to claim 1, 2 or 3 is stored in a non-volatile storage device or the magnetic disk, and the cumulative error occurrence count exceeds a predetermined value. A magnetic disk array storage device for automatically copying the stored contents of the magnetic disk storage device to another magnetic disk storage device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7001035A JPH08190762A (en) | 1995-01-09 | 1995-01-09 | Magnetic disk-array storage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7001035A JPH08190762A (en) | 1995-01-09 | 1995-01-09 | Magnetic disk-array storage device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08190762A true JPH08190762A (en) | 1996-07-23 |
Family
ID=11490318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7001035A Pending JPH08190762A (en) | 1995-01-09 | 1995-01-09 | Magnetic disk-array storage device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08190762A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0820059A2 (en) * | 1996-07-18 | 1998-01-21 | Hitachi, Ltd. | Magnetic disk storage device controle method, disk array system control method and disk array system |
| US7072576B2 (en) | 2000-08-04 | 2006-07-04 | Hitachi, Ltd. | Information storage system with increased reliability for continuous operation, and a recording control method |
| US7281088B2 (en) | 2004-01-16 | 2007-10-09 | Hitachi, Ltd. | Disk array apparatus and disk array apparatus controlling method |
| US7353406B2 (en) | 2003-11-26 | 2008-04-01 | Hitachi, Ltd. | Disk array optimizing the drive operation time |
| US7355806B2 (en) | 1999-04-05 | 2008-04-08 | Hitachi, Ltd. | Disk array unit |
| US7539817B2 (en) | 2005-12-02 | 2009-05-26 | Hitachi, Ltd. | Storage system and capacity allocation method therefor |
| US7890791B2 (en) | 2007-03-29 | 2011-02-15 | Nec Corporation | Disk array device, operating method thereof and program-storing medium |
-
1995
- 1995-01-09 JP JP7001035A patent/JPH08190762A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0820059A2 (en) * | 1996-07-18 | 1998-01-21 | Hitachi, Ltd. | Magnetic disk storage device controle method, disk array system control method and disk array system |
| EP0820059A3 (en) * | 1996-07-18 | 2001-02-21 | Hitachi, Ltd. | Magnetic disk storage device controle method, disk array system control method and disk array system |
| US6496318B1 (en) | 1996-07-18 | 2002-12-17 | Hitachi, Ltd. | Magnetic disk storage device control method, disk array system control method and disk array system |
| US7554758B2 (en) | 1999-04-05 | 2009-06-30 | Hitachi, Ltd. | Disk array unit |
| US7355806B2 (en) | 1999-04-05 | 2008-04-08 | Hitachi, Ltd. | Disk array unit |
| US8929018B2 (en) | 1999-04-05 | 2015-01-06 | Hitachi, Ltd. | Disk array unit |
| US7072576B2 (en) | 2000-08-04 | 2006-07-04 | Hitachi, Ltd. | Information storage system with increased reliability for continuous operation, and a recording control method |
| US7353406B2 (en) | 2003-11-26 | 2008-04-01 | Hitachi, Ltd. | Disk array optimizing the drive operation time |
| US7657768B2 (en) | 2003-11-26 | 2010-02-02 | Hitachi, Ltd. | Disk array optimizing the drive operation time |
| US7281088B2 (en) | 2004-01-16 | 2007-10-09 | Hitachi, Ltd. | Disk array apparatus and disk array apparatus controlling method |
| US7373456B2 (en) | 2004-01-16 | 2008-05-13 | Hitachi, Ltd. | Disk array apparatus and disk array apparatus controlling method |
| US8402211B2 (en) | 2004-01-16 | 2013-03-19 | Hitachi, Ltd. | Disk array apparatus and disk array apparatus controlling method |
| US7539817B2 (en) | 2005-12-02 | 2009-05-26 | Hitachi, Ltd. | Storage system and capacity allocation method therefor |
| US7743212B2 (en) | 2005-12-02 | 2010-06-22 | Hitachi, Ltd. | Storage system and capacity allocation method therefor |
| US7890791B2 (en) | 2007-03-29 | 2011-02-15 | Nec Corporation | Disk array device, operating method thereof and program-storing medium |
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